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Most overloads are caused by the main output devices. They will go short circuit if for example speaker wires have come into touch. Another cause is high volume or a faulty speaker. Or poor ventilation around the amp causing excess heat.
The only cure is to replace the device(s) generally located on the heat sink.

Very common problem with today's receivers. Receivers made today don't have a true preamp section in the amplifier and do not amplify the sound to the extent of an older receiver. I have large 15" front speakers on my system, and have stuck with my 15 year old receiver just because I know that a new receiver will not have the power to drive them well. Many of the newer receivers need to be turned up to 50-60% before you can even hear anything from the speakers.

I referred to a similar zone 2 arrangement for a Yamaha receiver. It shows a separate amplifier and notes that only analog signals are sent to zone 2. The analog output from a source must be connected to the analog input on your Pioneer unit for zone 2 to work. Your outdoor music environment will be limited to left and right front speakers and...alas...no surround

I had a similar problem with an SR4320 that I bought used at Goodwill. First of all, turn the volume knob down; 0 db is actually the highest volume. Not sure why Marantz did that; it's counterintuitive. Set it to a more normal volume like -30 db. If it suddenly starts working, you'll blow out your speakers (and possibly your eardrums).

Second, check the back of the unit. There are two RCA connections that say "Pre Out" and "Main In". This is where you could connect another amplifier or a graphic equalizer. But if you don't have either of those hooked up, you need to have them connected to each other. Apparently the unit shipped with jumpers connecting these plugs, but a prior owner must have taken them off.

All you need is a short (1 foot or less) red and white RCA stereo cable. Connect the top Pre Out to the top Main In plug with the white cable and the bottom Pre Out to the bottom Main In plug with the red cable.

Disconnect all speaker wires at the receiver, then turn it on and up. If it stays on, check your speaker wires one by one, then check your speakers one by one. If it still cuts out with nothing attatched, it needs serviced or replaced.

Just check your speaker cabling again. Make sure that all of them are seated properly, none is touching each other or the body of receiver. Rewire if necessary..Are you using banana plugs for connecting speaker or just directly. Some times even a little tiny wire touching the receiver could trigger the protect mode. Be careful, since protect mode is sometimes not fast enough and it could blown a few trasistors in the power circuit.
If everything else seems all right and still your receiver shut down when you raise the volume then it possible that there are bad connections on the main board that are set in.

This would generally happen if the system is slighly old or have dry solder and when you raise up the volume. This should be a simple repair that will not require parts. If you can solder, you will be able to repair this yourself. I could guide you a bit.
If not, then a local service center will change the local labor rate.
Hope you can sort out your problem with the above trouble shooting.
Let me know if I can guide you further.
Thanks for using FixYa!

First of, be sure volume is turned all the way down before or as you are powering it it.
Second if that does not work disconnect all speaker, and input/outputs. Power the device on and see if it says overload.
If it does skip the rest of these steps, your capacitors are bad or the power supply is no longer functioning correctly.
If it doesnt, start with testing each speaker at power up. Match the speaker to the output it goes on, power the device see if it says it.
If it does on any speaker test it is a speaker issue or a terminal issue. To test for terminal or speaker issue plug a different/ known to work speaker in that same terminal, if it doesnt say overload it is a speaker issue, if it does say overload it is a terminal issue.
Once you have made sure all speakers and terminals work correctly start plugging input and outputs in and test individually.

No, one of your speakers is damaged (could be an amp channel went bad, but speaker is more likely). Unplug all spkrs, then plug one in and see if it acts normal when turned up. Repeat this until all speakers are hooked up or the culprit spkr is found.

Firstly check all your speaker wiring. Any damage can cause a short which will overload the system. You might not notice it, due to the fact that when you have the system on loud, vibrations move the wires on the cabinets or elsewhere. So make certain there are no loose wires near the speakers terminals into each one. If all that is good go to the next check.
Check If the amp is getting VERY hot when the overload occurs, then it might have a faulty part(s) on it. This might have occurred if you have been using speakers that never did match the amps requirements in the first place.